In this universe there are many small and big masses. Among them the most massive mass is black hole. Nowadays, many persons are interested on black hole. Are you interested on it? If you're then let's start from its introduction.
Author: Prabesh Chudara
What is a black hole?
A
black hole is a region of spacetime (It is a scientific interpretation
that combines spaces and time as one whole.) from which nothing can
escape, not even light. It has an extremely high gravitational field
which sucks in everything that gets close to it. Around a black hole,
there is a mathematically defined surface called an 'event horizon' that
marks the point of no return. It is called 'black', because it absorbs
all the light that hits the horizon, reflecting nothing. The term "black
hole" was coined in 1967 by American astronomer, John Wheeler.
How do black holes form?
It
is believed that the smallest black holes formed when the universe
began. Stellar black holes are formed, when the centre of a huge star
falls in upon itself, or collapses. When this happens, it is called a
supernova. When it explodes, it scatters most part of the star into the
void of space, but leaves behind a small core that may became a neutron
star. If the remnant core is large enough, it forms into a black hole-
the dark star.
Do black holes expand in size?
Scientists
believe they do! Once a black hole has formed, it can continue to grow
by absorbing mass - gas and interstellar dust- from its surroundings.
But absorbing other stars and merging with other black holes, super
massive black holes of millions of solar masses may form. There is
general consensus that super massive black holes exists in the centres
of the most galaxies.
Do black holes have any bad effects on us?
Not
so far ! The closest black hole yet discovered are several thousand
light-year away- so far that they have had no effect on the Earth's
environment even when they are several million times the mass of the
sun.
Which is the largest black hole?
The
largest confirmed black hole inhabits the core of Messier 87 (M87), a
giant elliptical galaxy in the constellation, Virgo. The M87 black hole
appears to be about 6.6 billion times the mass of the Sun, with a
diameter of about 25 billion miles (40 billion km).
Which black hole is the closest to the Earth?
Earth's closest black hole, known to man, is Cygnus X-1. It is located about 6,070 light years away from the Earth.
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